Improvement in grinding-machines



v 3 Sheets-Sheet 1., J. R. BROWN, de cd. C. D. OWEN andL. SHARPE, Execut0rs.-

' GRINDING MACHINE] N 187,770, Patented Feb.'27-,1877.

77 INVENTUR- I wfi w I I, 4; I I 1 14 1414 l' N4 PETERS, PHOTO-LITHOGRAPHER, WASHINGTON. D O.

- BSheets-Sheet 2. J. R. BROWN, de cd.

G. D. OWEN and L. SHARPE, Exeeut; ors. GRINDING MACHINE.

No. 187,770. Patented Feb.27,18'77.

WITNESSES. 7 I Q IQMlwE-M NS WENTUH.

ATTUR NEY.

3 Sheets-Sheet 3. J. R. BROWN decd. G. D. OWEN and L. SHARPE, Executors.

GRINDING MACHINE.

No. 187,770. Patented Feb. 27, 1877.

[cHAnLEs 1).

UNITED STATEsPATEN'r OFFICE.

OWEN AND LUOIAN SHARPE, OF PROVIDENCE, RHODE ISLAND,

EXEOUTORS OF JOSEPH R. BROWN, DECEASED.

IMPROVEMENT lN GRINDING-MACHINES- Specification forming part of Letters Patent No. 187,770., dated February 27,1877; application filed October 28, 1876.

; To all whom it may concern Be it known that JOSEPH R. BROWN, deceased, late of the city of Providence, in the ,county of Providence and State of Rhode Island, did invent certain new and useful Improvements in Grinding-Machines; and we hereby declare that the following is a full,

clear, and exact description of the same, reference being bad to the accompanying drawings, forming part of this specification.

Figure 1 is a top view of the improved grinding-machine. (The two broken lines indicate the position of the center-line of the table to which the head and foot stocks are secured when the table is swung on either the central or the end pin.) Fig. 2 is a front elevation of the machine. Fig. 3 is an enlarged sectional view through the center of the grinding-machine, the base being shown as broken off. Fig. 4 is a plan view of the laterallyswinging base-plate, on which the wheetarbor is supstocks, and the wheel-arbor, can be adjusted to adapt the same to a great variety of work and under all the changes control the adjustment with the greatest nicety.

The grinding-machine is shown in Fig. 2 as supported on a base, which is provided with a convenient closet for holding wheels and such parts or attachments as are not in use. Firmly secured to this base is the stationary bed-plate A, provided with longitudinal grooves, similar to those of a planing'machine. In these grooves the table a reciprocates, being operated by a rack and pinion, or in any other manner. To protect the grooves and the feedworks from grit and dust, the reciprocating table a is made of such length as to always cover the bed-plate. To the reciprocating table a the adjustable table I) is secured by the .pin E at the center of the table b, or by the pin E at or near the end of the table b, and by the clamp-screws in the segmental slots ff. By these means the table I) may be adjusted to any desired angle within the limits of the slots ff, and when the ends (eitheroneor both). of the table I) are arranged with graduated indexes divided into degrees and fractions thereof, the adjustable table b may be accurately set to any desired angle, and tapering work may be ground with great accuracy. To secure accurate adjustment, the table 11 is provided with the adjusting-screw g.

When curved and irregular work is to be ground, the pin on which the table swings is placed near the end of the table at E, the adjusting-screw g is detached from the table, the pattern his secured to the brackets, so as to be in contact with the finger i, the spring k, secured'to the table a, keeps the finger i in contact with the pattern h, so that in its reciprocation the table 11, and the head and foot stocks which are secured to the table I), will be brought nearer to or farther from the grinding-disk, and, with them, the work to be operated upon, and the motion will be governed by the configuration of the pattern It, and irregular forms may be accurately ground.

In place of the spring k the table I) may be held so that the finger i will rest against the pattern by a weight secured to a chain, the

other end being secured to the table, which chain passes over a pulley, so that the tabie will followthe configuration of the pattern. The pattern It may be readily produced by placing a steel disk on the wheel-mandrel and securing a tracing-point to the finger i, and the irregular article in its finished state is placed between the head and foot stock, and the table I) reciprocated, thus marking the exact line of the configuration required in the pattern, all projections being double or nearly double the projections on the article. The head-stock U is also arranged to turn on a vertical center, and can thus be adjusted independent of the table I), and obtuse angles, either outside or inside, may be readily ground. When required, the circular base of the head-stock O is provided with a graduated index, so that the same may be set at any desired angle and firmly secured by the clamp-screws provided.

The wheel arbor and stand are supported on the base l, which is adjustably secured by clamp-screws to the swinging base m. (Shown enlarged in Fig. 4.) By this arrangement the wheel-arbor can be adjusted to any desired lower end with the bevel-gear p, and as this pivot forms the center on which the base a swings the wheel-arbor may be adjusted or reciprocated in any direction, as the pinion will in every direction gear into the rack 0, as is clearly shownin Fig. 3. The bevel-gearpengages with the bevel-gear q secured to the. horizontal shaft g, which extends to the front of the machine, and is provided with the disk It and the handle it. The face of the disk It may he graduated, so that the exact position of the grinding-disk may be known; and to facilitate the operation the clamp s is placed on the disk k,and two pins are placed on the stationary part of the machine, arranged so that when the clamp rests against the pin on the right-hand side the grinding-disk is at its proper place, and when the clamp rests against the pin on the left-hand side thegrinding-disk' is clear off the work. The gradual Wearing ofthe grinding-disk is compensated bya slight adjustment of the clamp s.

By this arrangement the operative can concentrate his attention on the work, and can feel when the grinding-disk is in its proper position without examining the index on the disk It.

The back rest U and the-cover V are shown in Fig. 3, to indicate their relative positions.

The wheel-arbor is arranged to extend beyond the bearings, and is provided with a smaller grinding-wheel, so that holes or cylinders may be ground inside, or by the use of the pattern h, with its curved sides.

It is a bridge, secured to the stationary part of the machine, and arranged to extend over the tables a and b, and is provided with a pan or recess, to receive the grit and water from the grinding-wheel; To this bridge t the back rest also is secured. v

This machine is specially adapted for circular grinding where accuracy and uniformity are required. such as hardened plugs, arbors,

spindles, reamers, cutters, 8150. It will grind straight, tapering, or curved, either inside or outside, and any angle, obtuse or otherwise, can be readily produced.

Having thus described the invention, We

claim as new and desire to secure by Letters Patent 1. In a grinding-machine, the combination, with the bed-plate, of a reciprocating table,

the latter made of sufficient length to cove" the bed-plate through the limit of travel o the table, and thereby prevent the ingress o dust or cuttings into the groove in said bed plate, substantially as set forth.

2. In a grinding-machine, the combination with a reciprocating table, of a table resting thereon, the latter secured to the reciprocat ing table, and provided with means to change its pivotal movement from its center to one of its ends, and thus move about a central or an end pivotal bearing-pin, substantially as and for the purpose set forth;

3. In a grinding-machine, the combination. with a reciprocating table, of a pivotal or vibrating table resting thereon, the latter serving as a support for the head and foot stocks of the machine, said pivotal table being provided with an adjusting-screw, g, whereby the pivotal table may be secured at any desired angle to the line of travel of the reciprocating table, substantially as and for the purpose set forth.

4:- The combination, with the wheel-arbor base, secured to a pivoted base, of the lower swinging base a, and the intermediate reciprocating base a, substantially as and for the purpose set forth.

5. The combination, with the reciprocating base n, pivoted base m, and wheel-arbor base I, of an actuating and pivotal shaft, the same provided with a pinion to engage with a rack secured to the reciprocating base, and with a gear-wheel which meshes with a corresponding gear secured to the main actuating-shaft. substantially as and for the purpose set forth 6. The combination, with a wheel-arbor con structed to have a pivoted'and reciprocating movement, of an actuating-shaft, which also serves as a pivotal bearing for the lower base of the grinding-Wheel, said shaft having a pinion secured to its upper end for engagement with a rack on a reciprocating base, and with a bevel-gear on its lower end which meshes with a corresponding gear-wheel secured to the end of the adjustingshaft, substantially as and for the purpose set forth.

7. The combination, with the shaft q, arranged at right angles to, andbeneath, the bed-plate of the machine, of a vertical actuating and pivotal shaft, for imparting movement to the grinding-wheel, the shaft q, provided with a suitable hand-wheel, for operating the same, substantially as and for the purpose set forth.

'8. The combination, with the laterally-adjustable wheel-arbor, having a grinding-wheel secured thereto outside of the arbor-bearings, of the headstock, pivoted to the vibrating table, whereby the machine is adapted for grinding the inner and outer surfaces of articles secured thereto, substantially as and for the purpose set forth.

9. The combination, with the Wheel-arbor.

of a grindingmachine, constructed to have both horizontal and pivoted adjustment, substantially asset forth, of an adjusting-shaft Mmi I provided with the disk 70 and clamp s, and both laterally and pivotally, substantially as stop-pins secured to the stationary portion of and for the purpose set forth. 1 the machine, substantially as and for the pur- CHAS. D. OWEN, v pose set forth. LUOIAN SHARPE,

10. In a grinding-machine, the combination, Emecutors. with the head and foot stocks, adapted to be Witnesses: adjusted both laterally and longitudinally, of JOSEPH A. MILLER,

a grinding-wheel constructed to be adjusted AMOS A. WHITE. 

